[6: European Committee of the Regions, Opinion on Socioeconomic structural change in Europe's coal regions, 136th plenary session, 7-9 October 2019, ECON-VI/041.]
[6: Europees Comité van de Regio's, Advies over sociaaleconomische structurele verandering van steenkoolregio's in Europa, 136e zitting, 7-9 oktober 2019, ECON-VI/041.]